B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 44/12 (2006.01) C08G 18/48 (2006.01) C08G 18/66 (2006.01)
Patent
CA 2074761
It has been discovered that a particular polyurethane formulation may be used to prepare "pour-in-place" (PIP) polyurethane foam articles where the formulation is injected into a mold bearing an exterior covering such as a fabric without the foaming liquid striking through the layer. The formulation employs a hydrophilic polyhydric compound to help the reactivity balance that minimizes penetration of the exterior covering while also stabilizing the rising foam against shear collapse without excessively tightening the foam. Contrary to the conventional expectation that the hydrophilic polyhydric compound would, cause strike through problems since it delays the initial reaction time, it has been found to have the noted stabilizing effect. A preferred hydrophilic polyhydric compound is glycerine. A preferred isocyanate for the formulation is tolylene diisocyanate (TDI), in contrast to diphenylmethane diisocyanate (MDI) heretofore used in PIP foams.
Gill William A.
Leung Siusun Kenneth
Aktiengesellschaft Bayer
Osler Hoskin & Harcourt Llp
LandOfFree
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